Children react as a carnivorous theropod known as the Australovenator dinosaur walks through crowds along the Southbank, in London, Monday, Feb. 18, 2013. The dinosaur is one of many that can be visited at the Erth's Dinosaur Petting Zoo, visiting from Australia, the creatures can be touched and fed at the Southbank Centre. (AP Photo/Kirsty Wigglesworth) less

Children react as a carnivorous theropod known as the Australovenator dinosaur walks through crowds along the Southbank, in London, Monday, Feb. 18, 2013. The dinosaur is one of many that can be visited at the ... more

Photo: Kirsty Wigglesworth, Associated Press

Children react as a carnivorous theropod known as the... Photo-4216335.57030 - Houston Chronicle

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A worker wheels a used tyre for recycling in a factory in the village of Gaber, western Bulgaria, on February 15, 2013. DIMITAR DILKOFF/AFP/Getty Images

A worker wheels a used tyre for recycling in a factory in the village of Gaber, western Bulgaria, on February 15, 2013. DIMITAR DILKOFF/AFP/Getty Images

Photo: Dimitar Dilkoff, AFP/Getty Images

A worker wheels a used tyre for recycling in a factory in the... Photo-4216336.57030 - Houston Chronicle

A man sits among his belongings on the beachfront beneath a large "Welcome to Sochi!" sign in central Sochi on February 18, 2013. With a year to go until the Sochi 2014 Winter Games, construction work and development continues as Olympic tests events and World Championship competitions are underway. LEON NEAL/AFP/Getty Images less

A man sits among his belongings on the beachfront beneath a large "Welcome to Sochi!" sign in central Sochi on February 18, 2013. With a year to go until the Sochi 2014 Winter Games, construction work and ... more

Photo: Leon Neal, AFP/Getty Images

A man sits among his belongings on the beachfront beneath a large... Photo-4216340.57030 - Houston Chronicle

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Taboola Gallery Frame Item-85307.57030 - Houston Chronicle

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An Afghan child plays on the barrel of a Soviet tank in the Behsood district of Jalalabad, Afghanistan, Monday, Feb 18, 2013. Despite being a mineral-rich country, four decades of war have left Afghanistan as one of the least developed countries in the world and highly dependent on foreign aid. (AP Photo/Rahmat Gul) less

An Afghan child plays on the barrel of a Soviet tank in the Behsood district of Jalalabad, Afghanistan, Monday, Feb 18, 2013. Despite being a mineral-rich country, four decades of war have left Afghanistan as ... more

Photo: Rahmat Gul, Associated Press

An Afghan child plays on the barrel of a Soviet tank in the Behsood... Photo-4216339.57030 - Houston Chronicle

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Three young displaced Syrian girls are seen in the Azaz camp for displaced people north of Aleppo province, Syria, Monday, Feb. 18, 2013. According to Syrian activists the number of people in the Azaz camp has grown by 3,000 in the last weeks due to heavier shelling by government forces. (AP Photo/Manu Brabo) less

Three young displaced Syrian girls are seen in the Azaz camp for displaced people north of Aleppo province, Syria, Monday, Feb. 18, 2013. According to Syrian activists the number of people in the Azaz camp has ... more

Photo: Manu Brabo, Associated Press

Three young displaced Syrian girls are seen in the Azaz camp for... Photo-4216509.57030 - Houston Chronicle